CN115785373A - Polyurethane rigid foam and preparation method and application thereof - Google Patents
Polyurethane rigid foam and preparation method and application thereof Download PDFInfo
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- 239000006260 foam Substances 0.000 title claims abstract description 41
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 24
- 239000004814 polyurethane Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 80
- 229920000570 polyether Polymers 0.000 claims abstract description 80
- 229920005862 polyol Polymers 0.000 claims abstract description 66
- 150000003077 polyols Chemical class 0.000 claims abstract description 40
- -1 carbonate ether polyol Chemical class 0.000 claims abstract description 29
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 28
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000012948 isocyanate Substances 0.000 claims abstract description 17
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003999 initiator Substances 0.000 claims abstract description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 8
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 7
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 7
- ZUFQCVZBBNZMKD-UHFFFAOYSA-M potassium 2-ethylhexanoate Chemical compound [K+].CCCCC(CC)C([O-])=O ZUFQCVZBBNZMKD-UHFFFAOYSA-M 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 150000001412 amines Chemical class 0.000 claims description 4
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 3
- GTEXIOINCJRBIO-UHFFFAOYSA-N 2-[2-(dimethylamino)ethoxy]-n,n-dimethylethanamine Chemical compound CN(C)CCOCCN(C)C GTEXIOINCJRBIO-UHFFFAOYSA-N 0.000 claims description 2
- WAPWXMDDHHWKNM-UHFFFAOYSA-N 3-[2,3-bis[3-(dimethylamino)propyl]triazinan-1-yl]-n,n-dimethylpropan-1-amine Chemical compound CN(C)CCCN1CCCN(CCCN(C)C)N1CCCN(C)C WAPWXMDDHHWKNM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000000178 monomer Substances 0.000 claims description 2
- 125000002524 organometallic group Chemical group 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 229920000515 polycarbonate Polymers 0.000 abstract description 8
- 239000004417 polycarbonate Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 238000007373 indentation Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OYWRDHBGMCXGFY-UHFFFAOYSA-N 1,2,3-triazinane Chemical compound C1CNNNC1 OYWRDHBGMCXGFY-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229920005906 polyester polyol Polymers 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical group 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002924 oxiranes Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Abstract
The invention discloses a polyurethane rigid foam, which comprises the following raw materials of a polyether composition and isocyanate, wherein the polyether composition comprises a first polyether polyol and a second polyether polyol; the first polyether carbonate ether polyol is a polyether carbonate ether polyol, and the initiator thereof is a polyol having a functionality of 2. The invention also discloses a preparation method and application of the polyurethane rigid foam. The polycarbonate polyol used as the raw material can improve the heat resistance of the product and the toughness of the foam, and has higher reaction activity, thereby helping to quickly cure, shortening the reaction time and quickly increasing the foam strength. When the polyurethane foam provided by the invention is used for spraying and winding a pipeline, the polyurethane foam can quickly cure the foam core part, so that the pipeline can bear pressure on a roller and can not crack, and the subsequent indentation and cracking in the winding process can be prevented. The preparation method and the construction mode of the invention are simple and convenient, the construction period is saved, the dependence on petroleum energy is reduced, the biodegradability is fast, and the invention has profound environmental protection significance.
Description
Technical Field
The invention relates to the technical field of polyurethane foam, in particular to polyurethane rigid foam and a preparation method and application thereof.
Background
With the increasing consumption of petroleum and other raw materials in the world, CO 2 The great emission of greenhouse gases causes a series of hazards such as global warming and the like, and how to utilize CO 2 Are increasingly closedAnd (6) pouring. Among these, the catalytic copolymerization of carbon dioxide and epoxides with H-functional starters to give polyether carbonate polyols is one of the effective ways of immobilization. The polyether carbonate polyol is a polymer which contains repeated carbonate groups and ether groups in a molecular main chain and has a hydroxyl group at the chain end, and compared with a polyurethane material synthesized by traditional polyols, a polyurethane material obtained by reacting the polyether carbonate polyol with isocyanate has excellent mechanical property, hydrolysis resistance, heat resistance, oxidation resistance, wear resistance and biodegradability, and is an environment-friendly material.
Polyurethane foam materials are important materials in pipe insulation due to their good thermal conductivity and easy processability. At present, compared with the traditional pouring pipeline, the spraying winding pipeline has a plurality of advantages, such as: the polyurethane foams in the axial direction, the flow distance is short, and the foam is uniformly distributed; the foam reaction speed is high, the foam density adjustment range is wide, and the method can be used for producing pipelines with any diameter and any heat preservation thickness and the like, and becomes a new process which is developed rapidly. The polyurethane foam prepared by the spraying winding method is formed by spraying through a high-pressure gun head, the reaction activity of raw materials is required to be high, the curing strength can be quickly increased, the rolling of a conveying roller can be borne, and meanwhile, the polyurethane foam has certain toughness to ensure that the foam is not cracked in the conveying process. In the current research on polyurethane materials, chinese patent document CN103159908A provides polyurethane for spraying and winding prefabricated direct-buried heat-insulating pipes, the functionalities of the used polyether polyols are all larger than 4, although the polyether polyols can be quickly cured to improve the strength, the foam is brittle due to the overall too high crosslinking degree, and the foam is easy to crack in the actual production; and only polyether is contained in the formula, so that the overall heat resistance is not high.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of insufficient mechanical property and heat resistance of the existing polyurethane foam for spraying the winding pipeline, and further provides a polyurethane hard foam and a preparation method and application thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides a polyurethane rigid foam, which comprises the following raw materials in parts by weight:
20-40 parts of first polyether polyol;
60-80 parts of second polyether polyol;
the first polyether carbonate ether polyol is a polyether carbonate ether polyol and the initiator is a polyol having a functionality of 2.
Further, the polyether carbonate polyol is prepared by adopting polyol with the functionality of 2 as an initiator and propylene oxide and carbon dioxide as polymerization monomers;
the second polyether polyol has a functionality of 5 to 7 and a hydroxyl number of 380 to 500.
The polyether composition also comprises 3-4 parts of water, 4-8 parts of catalyst and 5-10 parts of cross-linking agent.
The polyether composition also comprises 0.5-2 parts of foam stabilizer.
Preferably, the first and second liquid crystal display panels are,
the cross-linking agent comprises at least one of glycerol and triethanolamine; and/or the presence of a gas in the atmosphere,
the catalyst is at least one of amine and organic metal catalyst; and/or the presence of a gas in the gas,
the foam stabilizer is polydimethylsiloxane-alkylene oxide copolymer.
The amine catalyst comprises at least one of bis (dimethylaminoethyl) ether, triethylenediamine and tris (dimethylaminopropyl) hexahydrotriazine;
the organometallic catalyst includes at least one of potassium octoate and dibutyltin dilaurate.
Further, the isocyanate is polyphenyl polymethylene isocyanate, and the NCO mass fraction is 30-32%.
The mass ratio of the polyether composition to the isocyanate is 1.4-1.5.
The invention also provides a preparation method of the polyurethane rigid foam, which comprises the following steps:
mixing the raw materials of the polyether composition at 15-20 ℃ for 0.5-1h;
and (3) uniformly mixing the polyether composition and isocyanate, and foaming and forming to obtain the polyurethane hard foam.
The invention also provides application of the polyurethane rigid foam, which is applied to spraying and winding pipelines.
Compared with the prior art, the invention has the following beneficial effects:
(1) The polycarbonate polyol is used in the polyurethane rigid foam raw material provided by the invention, and the existence of ester bonds improves the bond energy between atoms, so that the heat resistance of the product can be improved; meanwhile, the polycarbonate polyol prepared by using 2-functional micromolecular alcohol as an initiator has a flexible long-chain structure, so that the toughness of foam can be effectively improved;
in addition, since the polycarbonate polyol contains a terminal carboxylic acid, the reactivity between the carboxylic acid and the isocyanate is higher than that of the secondary hydroxyl group of po polyether used for general rigid foam polyether, so that the polycarbonate polyol has higher reactivity, thereby helping rapid curing, shortening the reaction time and rapidly increasing the foam strength.
(2) According to the invention, polyether carbonate polyol is used for spraying polyurethane foam for winding the pipeline, so that the rapid curing performance of the foam core can be provided, and the pipeline can bear pressure quickly on the roller and cannot crack; and meanwhile, higher compressive strength can be provided, so that the steel is not easy to collapse and crack in the subsequent winding process.
(3) The preparation method disclosed by the invention has the advantages that the preparation method is only required to be carried out after uniform mixing and foaming molding, the construction mode is simple and convenient, and the construction period is saved; water is used as a foaming agent, so that greenhouse gases are not released to destroy the atmosphere; the polycarbonate polyol used in the invention uses greenhouse gas CO as raw material 2 The raw material cost of the polyhydric alcohol can be reduced, and the dependence on petroleum energy is reduced; compared with the polyurethane foam material prepared by common polyether polyol, the polycarbonate polyurethane foam material used in the invention has quick biodegradability and far-reaching environmental protection significance.
Detailed Description
The following examples are provided to better understand the present invention, not to limit the best mode, and not to limit the content and protection scope of the present invention, and any product that is the same or similar to the present invention and is obtained by combining the present invention with other features of the prior art and the present invention falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The second polyether polyols used in the present invention are all produced by the optima chemical company, inc, wherein:
polyether polyol 4190, functionality 7, hydroxyl number 490;
polyether polyol 6482, functionality 7, hydroxyl number 480;
the polyether polyol D210 having a functionality of 2 used in the comparative example was produced by optimized chemical Co., ltd, and the polyester polyol PS3152 was purchased from Spiran (Nanjing) chemical Co., ltd.
The foam stabilizers R-301 and R-3015 used are all polydimethylsiloxane-oxyalkylene copolymers, produced by optimized chemical company Limited;
the catalysts used were diethers, triethylenediamine, hexahydrotriazine, potassium octoate and dibutyltin dilaurate produced by air chemical company.
The isocyanate used was a polyphenyl polymethylene isocyanate of PM200 type manufactured by Vanhua chemical company with NCO parts by mass of 31%.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are conventional reagent products which are commercially available, and manufacturers are not indicated.
Example 1
The embodiment provides a polyurethane rigid foam, which comprises the following steps:
(1) Synthesis of polyether carbonate ether polyol:
firstly, adding 12.4kg of ethylene glycol into a reaction kettle, heating to 70 ℃, reacting for 3 hours, and then carrying out vacuum dehydration at 80 ℃;
adding 300g of DMC, replacing with nitrogen, heating to 120 ℃, introducing 92.8kg of propylene oxide and 17.6kg of carbon dioxide into the reaction kettle, reacting, continuously maintaining at 100 ℃ for 3 hours, and vacuumizing to obtain crude polyether polyol;
adding acid (75% by volume of phosphoric acid) into the crude polyether polyol to neutralize, adsorb and filter to obtain polyether carbonate polyol, and determining that the hydroxyl value is 112gKOH/g;
(2) Preparation of the polyether composition:
stirring 20kg of polyether carbonate ether polyol, 80kg of polyether polyol 6482, 5kg of triethanolamine, 2kg of foam stabilizer R301, 4.5kg of water, 0.5kg of diether, 0.3kg of triethylene diamine, 0.3kg of potassium octoate and 0.05kg of dibutyltin dilaurate at 25 ℃ for 0.5h to obtain a polyether composition;
(3) Preparing rigid polyurethane foam:
the polyether composition and 169kg of isocyanate were mixed and sprayed by using a high-pressure sprayer to obtain a polyurethane rigid foam.
Example 2
The embodiment provides a polyurethane rigid foam, which comprises the following steps:
(1) Synthesis of polyether carbonate polyol:
firstly, adding 21.2kg of diethylene glycol into a reaction kettle, heating to 70 ℃, reacting for 3 hours, and then carrying out vacuum dehydration at 80 ℃;
adding 160g of DMC, replacing by nitrogen, heating to 120 ℃, introducing 107.3kg of propylene oxide and 19.8kg of carbon dioxide into the reaction kettle, reacting, continuously maintaining at 100 ℃ for 3 hours, and vacuumizing to obtain crude polyether polyol;
adding acid (75% phosphoric acid by volume percentage) into the crude polyether polyol to neutralize, adsorb and filter to obtain polyether carbonate polyol, and determining that the hydroxyl value is 92gKOH/g;
(2) Preparation of the polyether composition:
stirring 30kg of polyether carbonate polyol B, 70kg of polyether polyol 4190, 5kg of triethanolamine, 2.5kg of foam stabilizer R-3015, 4.6kg of water, 0.6kg of triethylenediamine, 1.2kg of hexahydrotriazine, 0.3kg of potassium octoate and 0.08kg of dibutyltin dilaurate at 25 ℃ for 0.5h to obtain a polyether composition; 171.4kg of isocyanate.
(3) Preparing the rigid polyurethane foam:
the polyether composition and 171.4kg of isocyanate were mixed and sprayed using a high-pressure sprayer to obtain a polyurethane rigid foam.
Comparative example 1
This comparative example provides a rigid polyurethane foam, which differs from example 2 in that instead of the polyether carbonate ether polyol used in example 2, a polyether polyol and a polyester polyol having a functionality of 2 are used, the following steps:
(1) Preparation of the polyether composition:
stirring 15kg of polyether polyol D210 and 15kg of polyester polyol PS3152, 70kg of polyether polyol 4190, 5kg of triethanolamine, 2.5kg of foam stabilizer R-3015, 4.6kg of water, 0.6kg of triethylenediamine, 1.2kg of hexahydrotriazine, 0.3kg of potassium octoate and 0.08kg of dibutyltin dilaurate at 25 ℃ for 0.5h to obtain a polyether composition; 171.4kg of isocyanate.
(2) Preparing the rigid polyurethane foam:
the polyether composition and 171.4kg of isocyanate were mixed and sprayed using a high-pressure sprayer to obtain a polyurethane rigid foam.
Comparative example 2
This comparative example provides a rigid polyurethane foam which differs from example 1 in that instead of the polyether carbonate ether polyol used in example 1, a polyether carbonate ether polyol prepared using glycerol having a functionality of 3 as co-initiator was used, the procedure was as follows:
(1) Synthesizing polyether carbonate polyol:
firstly, adding 30kg of glycerol into a reaction kettle, heating to 70 ℃, and carrying out vacuum dehydration at 80 ℃;
adding 100g of DMC, replacing with nitrogen, heating to 120 ℃, adding 76.70kg of propylene oxide and 34.5kg of carbon dioxide into a reaction kettle, reacting, continuously maintaining at 100 ℃ for 3 hours, and vacuumizing to obtain crude polyether polyol;
adding acid (75% by volume of phosphoric acid) into the crude polyether polyol to neutralize, adsorb and filter to obtain polycarbonate polyol, and determining that the hydroxyl value is 86gKOH/g;
(1) Preparation of the polyether composition:
stirring 20kg of polyether carbonate ether polyol, 80kg of polyether polyol 6482, 5kg of triethanolamine, 2kg of foam stabilizer R301, 4.5kg of water, 0.5kg of diether, 0.3kg of triethylenediamine, 0.3kg of potassium octoate and 0.05kg of dibutyltin dilaurate at 25 ℃ for 0.5h to obtain a polyether composition;
(2) Preparing rigid polyurethane foam:
the polyether composition and 169kg of isocyanate were mixed and sprayed by using a high-pressure sprayer to obtain a polyurethane rigid foam.
Test examples
The polyurethane foams made in the examples and comparative examples were tested and the results are shown in Table 1:
TABLE 1 polyurethane foam Performance test results
As shown in the above table, the polyurethane foam obtained by the reaction of polyether carbonate polyol and isocyanate in the examples has good toughness and strength.
Comparative example 1, which does not use polyether carbonate ether polyol, has a compression strength of 300Mpa for a time period much longer than that of the examples, except that the compression strength and bending strength are significantly lower than those of the examples, indicating that the reactivity is significantly lower than those of the examples.
Comparative example 2 a polyether carbonate polyol was prepared using glycerol with a functionality of 3, which has a much lower flexural strength than the examples, since the higher functionality affects its structure, ultimately leading to a reduction in toughness.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The polyurethane rigid foam is characterized by comprising the following raw materials in parts by mass:
20-40 parts of first polyether polyol;
60-80 parts of second polyether polyol;
the first polyether carbonate ether polyol is a polyether carbonate ether polyol, and the initiator thereof is a polyol having a functionality of 2.
2. The rigid polyurethane foam according to claim 1, wherein the polyether carbonate polyol is prepared by using a polyol with a functionality of 2 as an initiator and propylene oxide and carbon dioxide as polymerization monomers;
the second polyether polyol has a functionality of 5 to 7 and a hydroxyl number of 380 to 500.
3. The rigid polyurethane foam according to claim 1 or 2, wherein the polyether composition further comprises 3 to 4 parts of water, 4 to 8 parts of a catalyst and 5 to 10 parts of a crosslinking agent.
4. The rigid polyurethane foam according to claim 3, wherein the polyether composition further comprises 0.5 to 2 parts of a foam stabilizer.
5. The rigid polyurethane foam according to claim 4,
the cross-linking agent comprises at least one of glycerol and triethanolamine; and/or the presence of a gas in the gas,
the catalyst is at least one of amine and organic metal catalyst; and/or the presence of a gas in the gas,
the foam stabilizer is a polydimethylsiloxane-oxyalkylene copolymer.
6. Polyurethane rigid foam according to claim 5,
the amine catalyst comprises at least one of bis (dimethylaminoethyl) ether, triethylenediamine and tris (dimethylaminopropyl) hexahydrotriazine;
the organometallic catalyst includes at least one of potassium octoate and dibutyltin dilaurate.
7. The rigid polyurethane foam according to any one of claims 1 to 6, wherein the isocyanate is a polyphenyl polymethylene isocyanate having an NCO mass fraction of 30 to 32%.
8. The rigid polyurethane foam according to any one of claims 1 to 7, wherein the mass ratio of the polyether composition to the isocyanate is 1.4 to 1.5.
9. The method for preparing the rigid polyurethane foam as set forth in any one of claims 1 to 8, comprising the steps of:
mixing the raw materials of the polyether composition at 15-20 ℃ for 0.5-1h;
and (3) uniformly mixing the polyether composition and isocyanate, and foaming and forming to obtain the polyurethane rigid foam.
10. Use of the rigid polyurethane foam according to any one of claims 1 to 8, for spraying winding pipes.
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